In the late 1960s, a conspiracy theory emerged that Paul McCartney was dead and had been replaced by The Beatles with a look-alike. Some people took the theory too seriously, especially since there are countless pictures and videos of McCartney that prove he’s alive. His daughter, Mary, recently addressed this theory and how it impacted her growing up.
The ‘Paul is Dead’ conspiracy theory picked up steam after ‘Abbey Road’ debuted

In 1967, a rumor began swirling that Paul McCartney had been killed in a vehicular accident, and The Beatles were currently using a look-alike to hide it from fans. These theories began blowing up after the cover for Abbey Road emerged, and many fans looked through every detail for clues.
Several of the alleged pieces of evidence fans believed supported the theory were Paul McCartney walking barefoot, an eerie license plate on a Volkswagen beetle, and each member of The Beatles representing a funeral procession. In an interview on Good Day New York, McCartney’s daughter addressed these supposed pieces of evidence and how a few were debunked.
“Dad’s like, ‘It was a sunny day.’ He had sandals on, and he just flipped off his sandals when they walked across because it was hot,” Mary explained. “But then, John Lennon’s wearing a white suit. Think they were like, ‘Oh, this means Paul is dead.’ And then in the background, apparently, there’s like the number plate that sort of almost reads like ‘271f,’ like if he was still alive, and people read all these things into it, but it was just reading into it.”